bulk collect no_data_found exception

Bulk collect当没有数据抛出异常跟implicit cursor 处理不一样。

先看一下implicit cursor的处理吧：

cl scr;
DECLARE
  l_descr hardware.descr%type;
BEGIN
  SELECT descr INTO l_descr FROM hardware WHERE aisle = 0 AND item = 0;
  dbms_output.put_line('Item was found');
EXCEPTION
WHEN no_data_found THEN
  dbms_output.put_line('Invalid item specified');
END;

bulk collect的处理就不一样。

cl scr;
DECLARE
type t_descr_list
IS
  TABLE OF hardware.descr%type;
  l_descr_list t_descr_list;
BEGIN
  SELECT descr bulk collect
  INTO l_descr_list
  FROM hardware
  WHERE aisle           = 0
  AND item              = 0;
  IF l_descr_list.count = 0 THEN
    raise no_data_found;
  END IF;
  dbms_output.put_line('Item was found');
EXCEPTION
WHEN no_data_found THEN
  dbms_output.put_line('Invalid item specified');
END;